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ksarita (Mechanical)
14 Mar 05 16:21
hi ,
i am doing a structural analysis on a part made of HDPE. i am assuming it to be a lineary elastic material. then what can be the best values for youngs modulus, poissons ratio, yeild stress. etc.

thanks in advance.
patprimmer (Publican)
14 Mar 05 17:00
Try searching polymer manufacturers websites, or E-funda, ot RTPcompany website.

Regards
pat   pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
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AlanD (Materials)
15 Mar 05 6:21
Have you tried looking in Matweb?

http://www.matweb.com/search/SearchSubcat.asp
ksarita (Mechanical)
15 Mar 05 7:47
hi
thanks for ur suggestions.
i tried matweb and efunda also, but i couldnt find poissons ratio.

thanks
sarita
patprimmer (Publican)
15 Mar 05 19:42
What about "e" modulus. It might be listed as APPARENT modulus as thermoplastics are subject to creep under load, and therefore are not fully elastic, and it is time, load, temperature dependant, therefor any measure of elastic recovery is normally qualified in some way.

Regards
pat   pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

ksarita (Mechanical)
16 Mar 05 8:03
hi ,

THis is one of the site where i got the data

http://www.cctplastics.com/hdpe.html

And these is the data given by Matweb

http://matweb.com/search/SpecificMaterial.asp?bassnum=O4000

THis the data from RTP Website

http://www.rtpcompany.com/info/data/0700/RTP700.htm

So tell me how to use this data appropritely.
and what about poissons ratio.

Thanks in advance
Sarita
Helpful Member!  CoryPad (Materials)
16 Mar 05 16:52
For solids, Poisson's ratio ranges between ~ 0.3 (fully elastic deformation) to 0.5 (fully plastic deformation).  Use both of these to see the behavior at the limits.

If the environment is room temperature with short loading time, then typical properties for HDPE are:

E = 1.05 GPa
ν = 0.35
yield stress = 25 MPa

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

ksarita (Mechanical)
17 Mar 05 7:56
THanks

-- Sarita
Helpful Member!  EdClymer (Mechanical)
18 Mar 05 8:38

Ksarita

Re properties of HDPE

I use 0.38 for Poisson's ratio (and have done for 30 years).

Modulus is highly variable with temperature, loading time and actual stress induced.

Dig deeper..

Ed Clymer
Birmingham
England

Ed Clymer
Resinfab & Associates
England

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